N-phenylmaleimide derivatives

ABSTRACT

NOVEL N-PHENYLMALEIMIDE DERIVATIVES PREFERABLE AS MICROBICIDES WHICH ARE REPRESENTED BY THE FORMULA   1-(2,5-DI(O=),4-R1-1,5-DIHYDRO-2H-PYRROL-1-YL),3,5-DI(X-),   4-R2-BENZENE   WHEREIN R1 REPRESENTS A HYDROGEN ATOM, A HALOGEN ATOM, A LOWER ALKYL GROUP OR A PHENYL GROUP, WHICH MAY HAVE BEEN SUBSTITUTED BY A HALOGEN ATOM; R2 REPRESENTS A HYDROGEN ATOM, A LOWER ALKYL GROUP OR A HALOGEN ATOM; AND X REPRESENTS A HALOGEN ATOM, PROVIDED THAT IN CASE R1 AND R2 ARE HYDROGEN ATOMS, X REPRESENTS OTHER HALOGEN ATOM THAN A CHLORINE ATOM. EXAMPLES OF SUCH DERIVATIVES ARE: N-(3&#39;&#39;,5&#39;&#39;-DI-BROMO OR IODO-PHENYL) MALEIMIDES, N-(3&#39;&#39;,4&#39;&#39;,5&#39;&#39;-TRIHALOGENOPHENYL) MALEIMIDES, N-(3&#39;&#39;,5&#39;&#39;-DIHALOGENO-4&#39;&#39;-ALKYLPHENYL) MALEIMIDES, N-(3&#39;&#39;,5&#39;&#39;-DIHALOGENOPHENYL)-3-METHYLMALEIMIDES, N-(3&#39;&#39;,5&#39;&#39;-DIHALOGENOPHENYL)-3-PHENYLMALEIMIDES, AND N-(3&#39;&#39;,5&#39;&#39;-DIHALOGENOPHENYL)-3-(HALOGENOPHENYL) MALEIMIDES. THESE COMPOUNDS ARE PREPARED BY CYCLIZING CORRESPONDING MALEIC ACID MONOANILIDES UNDER DEHYDRATION CONDITIONS.

United States Patent 3,743,654 N-PHENYLMALEIMIDE DERIVATIVES Alrira Fujinami, Ashiya-shi, Toshiaki Ozaki, Toyonakashi, Keiichiro Akiba, Takarazuka-shi, Sigeo Yamamoto, Toyonaka-shi, Katsuji Nodera, Nishinomiya-shi, Katsutoshi Tanaka, Takarazuka-shi, and Tadashi Ooishi, Minoo-shi, Japan, assignors to Sumitomo Chemical Company, Ltd., Osaka, Japan No Drawing. Filed Sept. 11, 1969, Ser. No. 857,217 Claims priority, application Japan, Oct. 9, 1968, 43/713,800 Int. Cl. C07d 27/18 US. Cl. 260-326.5 FM Claims ABSTRACT OF THE DISCLOSURE Novel N-phenylmaleimide derivatives preferable as microbicides which are represented by the formula wherein R represents a hydrogen atom, a halogen atom, a lower alkyl group or a phenyl group, which may have been substituted by a halogen atom; R represents a hydrogen atom, a lower alkyl group or a halogen atom; and X represents a halogen atom, provided that in case R and R are hydrogen atoms, X represents other halogen atom than a chlorine atom. Examples of such derivatives are:

N-(3,5'-di-bromo or iodo-phenyl) maleimides, N-(3',4,5-trihalogenophenyl) maleimides, N-(3,5'-dihalogeno-4'-al-kylphenyl) maleimides, N-(3,5-dihalogenophenyl)-3-methylmaleimides, N(3,5'-dihalogenophenyl)-3-phenylmaleimides, and N- 3 ,5 -dihalogenophenyl -3- (halo genophenyl) maleimides.

These compounds are prepared by cyclizing corresponding maleic acid monoanilides under dehydration conditions.

BACKGROUND OF THE INVENTION This invention relates to novel N-phenylma eimide derivatives valuable as microbicides; to a proc ss for the preparation thereof; and to microbicidal co positions containing said derivatives.

More particularly, the invention pertains to N-phenylmaleimide derivatives represented by the formula wherein R represents a hydrogen atom, a halogen atom, a lower alkyl group or a phenyl group, which may have been substituted by a halogen atom; R represents a hydrogen atom, a lower alkyl group or a halogen atom; and X represents a halogen atom, provided that in case R and R are hydrogen atoms, X represents other halogen atom than a chlorine atom.

Heretofore, not a few N-phenylmaleimide derivatives have been well known. However, the N-phenylmaleimide 3,743,654 Patented July 3, 1973 are OBJECTS OF THE INVENTION It is therefore the objects of the present invention to provide novel N-phenylmaleimide derivatives, a process for the preparation thereof, and microbicidal compositions containing said derivatives.

CHEMICAL COMPOUNDS Among the novel compounds represented by the Formula l of the present invention, typical compounds are as enumerated below.

Compound No. Chemical structure N- '-5-dibromophenyl) maleimide N-(3,4',5-triehlorophenyl) malelmide [Z II 0 Cl N-(3,5'-diehloropheny1)-2-methylmaleimide mo A \N -Cl N-(3,4,5'-trichlorophenyl)-2-methymalelmlde.

N-(3,5"dichlorophenyl)-2-chloromaleimide g H: Q

l g I N-(3,5-diiodophenyl) maleimlde Compound No. Chemical structure N-(3,5-diehlorophenyl)-2-phenylmaleimide N-(3,5-d1chlorophenyl)-2-(2-ehloropheny1) maleimide UTILITY The compounds of the present invention have prominent elfects on rice blast fungus (Pyricularia oryzae), rice sheath blight fungus (Pellicularia sasakii), rice Helminthosporium leaf spot fungus (Cochliobolus miyabeanus), and scleorotium fungus and powdery mildew fungus of agricultural and horticultural crops, and hence are utilizable as plant disease-controlling agents. Further, they are effective also for the control of Aspergillus niger, which propagates in industrial products. Nevertheless, they have little detrimental actions on mammals. For example, the N-(3',5'-dichlorophenyl)-2-methylmaleimide of the present invention scarcely has oral toxicity to mice, and not a mouse was killed even when said compound was administered in a dose of 2,000 mg./kg. Further, the 50% lethal concentration of said compound to gold fish was 10 ppm. or more. Microbicides having such broad antimicrobial spectra and strong microbicidal actions have never been proposed heretofore. Accordingly, the utility of the present compounds in the industrial fields is tremendous.

As the result of studies for years, the present inventors have found such characteristic physiological activities of the present compounds are greatly dependent on the kinds and positions of substituents on the benzene rings, which are skeletons of the N-phenylmaleimides. That is, it has been found that halogen atoms should have simultaneously been substituted in the 3- and -positions of the benzene ring; that in case the number of substituents is 3, the third substituent should be in the 4-position; that the number of substituents should be 2 or 3; and that in case no such conditions as mentioned above are not satisfied, the compounds are markedly lowered in activity and are entirely deprived of practicality as microbicides. The present invention has been accomplished on the basis of such new findings as mentioned above, and the N-phenylmaleimide derivatives represented by the Formula I satisfy all the above-mentioned conditions.

PROCESS The novel compounds represented by the Formula I of the present invention are prepared by dehydrating and cyclizing, according to the present invention, N-phenylmaleic acid monoamide derivatives represented by the Formula II or III.

x I o ONHQR: B1

ooorr (III) wherein R R and X are as defined previously.

The N-phenylmaleic acid monoamide derivatives of the Formulas II and III, which are starting materials employed in the present process, can be easily obtained according to ordinary procedures from corresponding maleic anhydrides and anilines. Typical maleic anhydrides and anilines are as set forth below, but it is needless to say that the scope of the present invention is not limited thereby.

Maleic anhydrides:

Maleic anhydride 2-chloromaleic anhydride 2-bromomaleic anhydride Z-methylmaleic anhydride Z-ethylmaleic anhydride 2-propylmaleic anhydride Z-phenylrnaleic anhydride 2-(2'-chlorophenyl) maleic anhydride 2-(3'-chlorophenyl) maleic anhydride 2-(4'-chlorophenyl) maleic anhydride Anilines:

3,5-dichloroaniline 3,5-difluoroaniline 3,4,5-trichloroaniline 3,5-dibromoaniline 3,4,5-tribromoaniline 3,S-dichloro-4-rnethylaniline 3,5-dichloro-4-bromoaniline 3,5-dibromo-4-chloroaniline 3,5-dibromo-4-methylaniline 3,S-dichloro-4-propylaniline 3,5-diiodoaniline In practicing the present process, the starting monoamides are merely heated and melted at about 0., whereby the desired products can be obtained. Desirably, however, the starting monoamides are refluxed with stirring in the presence of a suitable dehydrating agent, e.g. acetic anhydride, acetyl chloride, phosphorus pentachloride or phosphorus oxychloride, preferably acetic anhydride, whereby the desired products can be obtained easily and in high yields. In this case, the reaction time is adequately about 1 hour.

MICROBICIDAL COMPOSITIONS:

In actual application as microbicides, the thus obtained compounds of the present invention may be used in pure form without incorporation of other ingredients. For easier application as microbicides, however, they may be used in admixture with inert carriers and can be formulated into any of the ordinarily adopted forms such as, for example, dusts, wettable powders, oil sprays, sprays, tablets, emulsifiable concentrates, granules, etc. Further, the present compounds may be used in admixture with other chemicals such as, for example:

Blasticidin-S', Kasugamycin,

9 PREPARATION OF MICROBICIDAL COMPOSITIONS The active compound employed is represented by the number of each compound exemplified previously.

Example 11.Dust

3 parts of the compound (3) and 97 parts of clay were thoroughly pulverized and mixed together to obtain a dust containing 3 of active ingredient. In application, the dust was dusted as it was.

Example 12.-Dust 4 parts of the compound (10) and 96 parts of talc were thoroughly pulverized and mixed together to obtain a dust containing 4% of active ingredient. In application, the dust was dusted as it was.

Example 13.Wettable powder 50 parts of the compound (7), 5 parts of a wetting agent of alkylbenzenesulfonate type and 45 parts of diatomaceous earth were thoroughly pulverized and mixed together to obtain a wettable powder containing 50% of active ingredient. In application, the wettable powder was diluted with water and was sprayed.

Example 14.-Emulsifiable concentrate parts of the compound (6), 80 parts of dimethyl sulfoxide and 10 parts of an emulsifier of polyoxyethylene phenylphenol ether type were mixed together to obtain an emulsifiable concentrate containing 10% of active ingredient. In application, the emulsifiable concentrate was diluted with water and was sprayed.

Example .Granule 5 parts of the compound (5), 93.5 parts of clay and 1.5 parts of a binder of polyvinyl alcohol type were thoroughly pulverized and mixed together. After kneading with water, the mixture was granulated and dried to obtain a granule preparation containing 5% of active ingredient.

Example 16.-Composite dust 2 parts of the compound (1), 1.5 parts of O-n-butyl- S-ethyl-S-benzyl phosphorodithiolate, 0.1 part of Kasugamycin and 96.4 parts of clay were thoroughly pulverized and mixed together to obtain a dust containing 3.6% of active ingredient. In application, the dust was dusted as it was.

Example 17.-Composite dust 2 parts of the compound (4), 1.5 parts of O-n-butyl- S-ethyl-S-benzyl phosphorodithiolate, 2 parts of 0,0-dimethyl-O-(3-methyl-4-nitrophenyl) phosphorothioate, 1.5 parts of 3,4-dimethylphenyl-N-methyl carbamate and 93 parts of clay were thoroughly pulverized and mixed together to obtain a dust containing 7% of active ingredient. In application the dust was dusted as it was.

Eifects: In order to substantiate excellent microbicidal elfects of the present compounds, typical test results will be shown in the test examples set forth below.

Test Example l.-Eifects of controlling rice blast fungus (Pyricularia oryzae Rice plants (variety: Waseasahi), which had been cultivated to the 3 leaves stage in flower pots of 9 cm. in diameter, were individually sprayed with 7 ml./pot of an aqueous dilute solution of each of test chemicals in the form of wettable powders. After one day, the rice plants were sprayed and inoculated with a spore suspension of rice blast fungus (Pyricularia oryzae). 5 days thereafter, the number of disease spots generated was counted to investigate the fungicidal efiect of each chemical, whereby the results shown in Table 2 were obtained. As seen in Table 2, the present compounds showed markedly excellent effects as compared with the control known compounds.

TABLE 2 Active Number ingredient of spots concentration er 10 Compound (p.p.m.) eaves Cl Q-mzooo 0,11 500 225 l Cl (Known compound) Non-treatment. 377

Control.

Test Example 2.-Etfects of controlling rice Helminthosporium leaf spot fungus (Cochliobolus miyabeanus) Rice plants (variety: Waseasahi), which had been cultivated to the 4 leaves stage in flower pots of 9 cm. in diameter, were individually dusted by use of a bell jar duster with mg./pot of each of test chemicals in the form of dusts. After one day, the rice plants were sprayed and inoculated with a spore suspension of rice Helminthosporium leaf spot fungus (Cochliobolus miyabeanus).

3 days thereafter, the number of disease spots generated was counted to investigate the fungicidal elfect of each chemical, whereby the results shown in Table 3 were obtained. As seen in Table 3, the present compounds showed markedly prominent efiects as compared with the control known compounds.

TABLE 3 Active ingredient coneentra- Number on of spots Compound (percent) per leaf (Known compound) fil) 3.0 67 /CCCl' l C- H ll (Known compound) C-CH (Known compound) Non-treatment. 78

' Control.

1 1 Test Example 3.-Efiects of controlling rice sheath blight fungus (Pellicularia sasakii) Rice plants (variety: Waseasahi) were cultivated four stems in each of flower pots of 9 cm. in diameter. When grown to a height of 50-60 cm., the plants were sprayed with 10 ml./pot of an aqueous dilute emulsion of each of test chemicals in the form of emulsifiable concentrates. After 3 hours, mycelial disc inoculum of rice sheath blight fungus (Pellicularia sasakii) were applied to and inoculated in the leaf sheaths of individual stems of the plant. 5 days thereafter, the sizes of disease spots generated on the leaf sheaths were measured to calculate the degrees of damage and to investigate the fungicidal effects of the chemicals. The results were as shown in Table 4. As seen in Table 4, the present compounds showed markedly prominent controlling effects as compared with the control known compounds.

NOTE.-(TUZ)=AD 80% wettable powder comprising: monomethylarsiue-bis-dimethyl dithiocarbamate, 20%; zinc dimethyl dithiocarbamate, 20%; tetramethylthiuram disulfide, 40%.

Test Example 4.--Eifects of controlling powdery mildew (Sphaerotheca fuliginea) 0f cucurbitaceous plants Pumpkin plants (variety: Heian Kogiku) were cultivated in flower pots of 12 cm. in diameter. When grown to the 3-4 leaves stage, the plants were sprayed with 7 ml./pot of each of given concentration solutions of test chemicals in the form of wettable powders. One day after, the plants were sprayed and inoculated with a spore suspension of cucurbitaceous plant mildew fungus (Sphaerotheca fuliginea). 10 days thereafter, the state of disease of 4 leaves at the upper portion of each plant was observed, and the degree of damage was calculated from the area of spots generated. In each treatment, 7 pots were tested to obtain the results shown in Table 5. As seen in Table 5, the present compounds displayed markedly excellent effects as compared with the control known compounds.

TABLE 5 Active ingredient Degree concentraof Compound tion (p.p.m.) damage NBC 0 0 0 115 (Known compound) (I) 500 46.1 /(iCCH fi-CH (Known compound) Non-treatment A 50.9

*Control.

Test Example 5.-Eifects of controlling damping-0d fungus (Pellicularia filamentosw) of cucumber plants Flower pots of 9 cm. in diameter were individually packed with a farm soil. Further, 10 ml./pot of a contaminated soil, in which had been cultured and propagated cucumber seedling damping-off fungus (Pellicularia filamentasa), was uniformly spread on the surface of said farm soil. Subsequently, the soil was irrigated with 15 ml./pot of a 500 p.p.m. aqueous emulsion of each of test chemicals in the form of emulsifiable concentrates. After 2 hours, 10 seeds per pot of cucumber (variety: Kairyo Aodaicho) were sowed in the soil. 5 days thereafter, the state of disease of cucumber seedlings was observed to calculate the ratio of non-damged seedlings and to investigate the fungicidal elfects of the chemicals. The results were as set forth in Table 6. As seen in Table 6, the present compounds showed markedly excellent effects.

TABLE 6 Stand Active ercent ingredient ratio of concentration non-damaged Compound (p.p.m.) seedlings) NH0 0 0 02H? 1 (Known compound) 01 Pentaehloronitrobenzene* (commercially 500 86 available microbicide) Non-treatment, inoculated with fungus 0 N on-treatment, no fungus inoculated Control.

Test Example 6.-Antimicrobial spectra According to the agar medium dilution method, the growth-inhibiting effects of the compound (4) on various plant pathogenic fungi and bacteria were investigated to obtain the results as set forth in Table 7.

According to the same method as mentioned above, the growth-inhibiting efiects of compounds on (Aspergillus niger ATCC 9642 strain) were investigated to obtain the results as set forth in Table 8.

TABLE 8 Effective concentration (p.p.m.

(Control) Norn.1,000 shows that no effect was observed at a concentration of 1,000 p.p.m.

What is claimed is: 1. An N-phenylmaleimide derivative represented by the formula:

x k C? n: R:

o g X wherein R represents a halogen atom, a lower C -C alkyl group, a phenyl group or a halogen-substituted phenyl group; R represents a hydrogen atom, a lower C -C alkyl group or a halogen atom; and X represents a halogen atom.

2. An N-phenylmaleimide derivative according to claim 1, wherein R is a lower C -C alkyl group, R is a hydrogen atom and X is a halogen atom.

3. An N-phenylmaleimide derivative according to claim 1 wherein R represents a lower C -C alkyl group or a halogen atom.

4. An N phenylmaleimide derivative represented by the formula N 110/ ll wherein R represents a phenyl group or a halogen-substituted phenyl group; R represents a hydrogen atom, a C to C alkyl group or a halogen atom; and X represents a halogen atom.

phenylmaleimide derivative represented by 0 Br 1k 1 l: 2

6. An N phenylmaleimide derivative represented by the formula 0 i H: \N ll 1 7. An N phenylmaleimide derivative represented by the formula.

5. An N the formula 8. An N phenylmaleimide derivative represented by the formula Hr- E (I:

9. An N phenylmaleimide derivatives represented by the formula 10. An N phenylmaleimide derivative represented by the formula References Cited UNITED STATES PATENTS 3,394,145 7/ 1968 Bublitz 260-3265 2,788,349 4/1957 Snyder 260-3263 2,262,262 11/1941 Speer 260-3265 3,586,697 6/1971 Ozaki et al. 260-3265 OTHER REFERENCES Keit't, Chem. Abs. 55: 7566e (1961). Kretov et al., Chem. Abs. 50: 13772a (1957).

JOSEPH A. NARCAVAGE, Primary Examiner us. c1. X.R. 424-214 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent; 3,143,654 Dated July-3, 1913 Inventor(s) AKIRA FUJINAMI, ET. AL.

It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

On the cover sheet insert The portion of the term of this patent subsequent to June 22, 1988, has been disolaimed.

Signed and sealed this 21st day of January 1975.

(SEAL) Attest:

MCCOY M. GIBSON JR. c. MARSHALL DANN- Attesting Officer Commissioner of Patents FORM PO-1050 (10- 9) USCOMM-DC wan-ps9 u.s. sovzmmnn murmur, OFFICE: 930 

